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mod palettes;
pub use palettes::Palette;
use clocksource::DateTime;
use heatmap::*;
use image::*;
use palettes::*;
use rusttype::{point, Font, PositionedGlyph, Scale as TypeScale};
use std::collections::HashMap;
use std::convert::TryInto;
#[derive(Copy, Clone)]
pub enum Scale {
Linear,
Logarithmic,
}
pub struct WaterfallBuilder {
output: String,
labels: HashMap<u64, String>,
palette: Palette,
interval: Duration,
scale: Scale,
smooth: Option<f32>,
}
impl WaterfallBuilder {
pub fn new(target: &str) -> Self {
Self {
output: target.to_string(),
labels: HashMap::new(),
palette: Palette::Classic,
interval: Duration::from_secs(60),
scale: Scale::Linear,
smooth: None,
}
}
pub fn label(mut self, value: u64, label: &str) -> Self {
self.labels.insert(value, label.to_string());
self
}
pub fn palette(mut self, palette: Palette) -> Self {
self.palette = palette;
self
}
pub fn scale(mut self, scale: Scale) -> Self {
self.scale = scale;
self
}
pub fn smooth(mut self, sigma: Option<f32>) -> Self {
self.smooth = sigma;
self
}
fn weight(&self, count: u64, width: u64) -> f64 {
match self.scale {
Scale::Linear => count as f64 / width as f64,
Scale::Logarithmic => (count as f64 / width as f64).log2(),
}
}
fn max_weight(&self, heatmap: &heatmap::Heatmap) -> f64 {
let mut max_weight = 0.0;
for slice in heatmap {
for b in slice.histogram() {
let weight = self.weight(b.count().into(), b.high() - b.low() + 1);
if weight > max_weight {
max_weight = weight;
}
}
}
max_weight
}
pub fn build(self, heatmap: &heatmap::Heatmap) {
let now_datetime = DateTime::now();
let now_instant = Instant::now();
let height = heatmap.windows();
let width = heatmap.buckets();
let mut buf = RgbImage::new(width.try_into().unwrap(), height.try_into().unwrap());
let begin_instant = heatmap.into_iter().next().unwrap().start();
let max_weight = self.max_weight(heatmap);
let colors = match self.palette {
Palette::Classic => CLASSIC,
Palette::Ironbow => IRONBOW,
};
let mut labels = HashMap::new();
for (k, v) in &self.labels {
labels.insert(*k, v);
}
let mut label_keys: Vec<u64> = labels.keys().cloned().collect();
label_keys.sort_unstable();
let mut l = 0;
if let Some(sigma) = self.smooth {
for (y, slice) in heatmap.into_iter().enumerate() {
for (x, b) in slice.histogram().into_iter().enumerate() {
let weight = self.weight(b.count().into(), b.high() - b.low() + 1);
let scaled_weight = weight / max_weight;
let index = (scaled_weight * (colors.len() - 1) as f64).round() as u8;
buf.put_pixel(
x.try_into().unwrap(),
y.try_into().unwrap(),
Rgb([index, index, index]),
);
}
}
buf = image::imageops::blur(&buf, sigma);
for x in 0..buf.width() {
for y in 0..buf.height() {
let index = buf.get_pixel(x, y).0[0];
let color = colors[index as usize];
buf.put_pixel(x, y, Rgb([color.r, color.g, color.b]));
}
}
} else {
for (y, slice) in heatmap.into_iter().enumerate() {
for (x, b) in slice.histogram().into_iter().enumerate() {
let weight = self.weight(b.count().into(), b.high() - b.low() + 1);
let scaled_weight = weight / max_weight;
let index = (scaled_weight * (colors.len() - 1) as f64).round() as usize;
let color = colors[index];
buf.put_pixel(
x.try_into().unwrap(),
y.try_into().unwrap(),
Rgb([color.r, color.g, color.b]),
);
}
}
}
if !label_keys.is_empty() {
let slice = heatmap.into_iter().next().unwrap();
for (x, bucket) in slice.histogram().into_iter().enumerate() {
let value = bucket.high();
if value >= label_keys[l] {
if let Some(label) = labels.get(&label_keys[l]) {
render_text(label, 25.0, x, 0, &mut buf);
for y in 0..height {
buf.put_pixel(
x.try_into().unwrap(),
y.try_into().unwrap(),
Rgb([255, 255, 255]),
);
}
}
l += 1;
if l >= label_keys.len() {
break;
}
}
}
}
let offset = std::time::Duration::from_nanos((now_instant - begin_instant).as_nanos() as _);
let begin_utc = now_datetime - offset;
let mut begin = begin_instant;
for (y, slice) in heatmap.into_iter().enumerate() {
let slice_start_utc = begin_utc
+ std::time::Duration::from_nanos((slice.start() - begin_instant).as_nanos() as _);
if slice.start() - begin >= self.interval {
let label = format!("{}", slice_start_utc);
render_text(&label, 25.0, 0, y + 2, &mut buf);
for x in 0..width {
buf.put_pixel(
x.try_into().unwrap(),
y.try_into().unwrap(),
Rgb([255, 255, 255]),
);
}
begin += self.interval;
}
}
buf.save(&self.output).unwrap();
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
pub(crate) struct ColorRgb {
pub r: u8,
pub g: u8,
pub b: u8,
}
fn render_text(string: &str, size: f32, x_pos: usize, y_pos: usize, buf: &mut RgbImage) {
let font_data = dejavu::sans_mono::regular();
let font = Font::try_from_bytes(font_data as &[u8]).unwrap();
let height: f32 = size;
let scale = TypeScale {
x: height * 1.0,
y: height,
};
let v_metrics = font.v_metrics(scale);
let offset = point(0.0, v_metrics.ascent);
let glyphs: Vec<PositionedGlyph> = font.layout(string, scale, offset).collect();
for g in glyphs {
if let Some(bb) = g.pixel_bounding_box() {
g.draw(|x, y, v| {
let x = (x as i32 + bb.min.x) as usize;
let y = (y as i32 + bb.min.y) as usize;
if v > 0.25 {
let x = (x + x_pos).try_into().unwrap();
let y = (y + y_pos).try_into().unwrap();
if x < buf.width() && y < buf.height() {
buf.put_pixel(x, y, Rgb([255, 255, 255]));
}
}
})
}
}
}